distribution/src/main/resources/drill-am-log.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!--

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    or more contributor license agreements.  See the NOTICE file
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    "License"); you may not use this file except in compliance
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-->
<!--
 Logging settings for the Drill-on-YARN application master.
 See http://logback.qos.ch/manual/index.html for more information.

 YARN already captures stdout and stderr, and the AM produces
 moderate amount of logging, so the logging simply goes to stdout
 and from there into the YARN-provided output log directory.
-->
<configuration>

  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
      </pattern>
    </encoder>
  </appender>

  <logger name="org.apache.drill" additivity="false">
    <level value="info" />
    <appender-ref ref="STDOUT" />
  </logger>

  <!-- All Drill-on-YARN code is under the org.apache.drill.yarn package.
       Level defaults to info, which provides an overview of AM activities.
       Set to "error" if the information is not needed.
  -->
  <logger name="org.apache.drill.yarn" additivity="false">
    <level value="info" />
    <appender-ref ref="STDOUT" />
  </logger>

  <root>
    <level value="error" />
    <appender-ref ref="STDOUT" />
  </root>

</configuration>